In my project when i send Rest Response to Advance Rest Client It only shows Fields which Have some values and Ignores(Does not show) fields which have NULL Values or Empty values.
Part Of Code:
Gson gson=new Gson();
// firstResponse is Object which contains the values
String jsonString = gson.toJson(firstResponse);
test.saveJson(jsonString); //OR System.out.println(jsonString);
return Response.ok(firstResponse).build(); // Response to Rest Client
Response sample To return Response.ok(firstResponse).build();
Advance rest client From web project :
{
"Name": "smith",
"Properties": {
"propertyList": [
{
"ID": "072",
"Number": "415151",
"Address": "Somewhere"
},
{
"ID": "151",
"Number": "a800cc79-99d1-42f1-aeb4-808087b12c9b",
"Address": "ninink"
},
{
"ID": "269",
},
],
},
}
Now when i save this as Json String in DB or When i want to Print this to console it also prints the fiels with null or empty values:
{
"Name": "smith",
"Properties": {
"propertyList": [
{
"ID": "072",
"Number": "415151",
"Address": "Somewhere"
},
{
"ID": "151",
"Number": "a800cc79-99d1-42f1-aeb4-808087b12c9b",
"Address": "ninink"
},
{
"ID": "269",
"Number": "",
"Address": ""
},
],
},
"resultList" :[]
}
How can i print or save this JSON string same as response in rest client i.e. i dont want to print null or empty value field i just want to ignore them.
in top og entity class , try with the annotation
#JsonInclude(Include.NON_EMPTY)
this annotation don't show any empty field in your json.
Not giving you a code but here are some pointers for you:
Read the manual: How to handle NULL values
You may need to use a custom exclusion strategy
Also read this Q&A: Gson: How to exclude specific fields from Serialization without annotations
Related
i am trying to generate a class model from an APIs JSON response (List), i use some service for auto-generation, and everything seems to work fine until the response JSON start returning attributes with a null value and the other thing is that some attributes are missing when i call the APIs. EX:
response JSON:
[
{
"persone": {
"name": "To John",
"age": 15
},
"group": "ipsum"
},
{
"persone": {
"name": "To John",
"age": null
},
"group": "ipsum"
},
{
"persone": {
"name": "To John"
}
}
]
in the above example, the age attribute is null, and the group attribute is missing in the last object of the list.
My question is how do you create an appropriate class model in that case handling the null and the missing attribute?
I have a Json object like this in my Postgres DB:
{
"emails": [
{
"email": {
"id": "e8dc927f-679d-496b-85fb-465edf35c676",
"value": "hello#gmail.com"
}
},
{
"email": {
"id": "1b78758a-abc4-46ef-9de9-c999a0c8c418",
"value": "hello1#gmail.com"
}
}
],
"lastName": {
"id": "718109fd-2d00-475a-829a-c8af9a7f0067",
"value": "lastName"
},
"firstName": {
"id": "6c46a5b3-6f89-4692-a214-4943de22018d",
"value": "firstName"
},
}
And so on big json with around 1000 elements, now I want to parse and get the first 500 elements from json and make another json. what I mean by element here is anything which has Id is a element. For example firstName , LastName, email, email are the elements not the emails. I tried Jackson api but couldn't find a way how to count the elements and make a json exactly like above and return. and when I do any modifications in the first 500 elements I should save the Json with edits. Any help is much appreciated. I even tried postgres array_agg(e) function but that is only accepting only array.
I want to get the value at the field first inside name.
How i can access in this field using HashMap in java
{ "payload":{
"name": {
"first": "jean",
"last": "bob,
},
"address": {
"code": "75",
"city": "paris",
"country": "France"
},
}}
Use one of the available Java libraries for handling JSON. E.g. Gson from Guava API. They are pretty straing fw.
"transaction": {
"id": 1,
"empid": "12345",
"details1": {
"name": "xyz",
"age": "30",
"sex": "M",
"Address": {
"Office": "office",
"Home": "Home"
}
},
"abcDetails": "asdf",
"mobile": 123455
},
I need to test if JSON record contains more then two keys(details, Address).
Then, I need to pass those key input to this line:
parserValue1 = parserValue.asObject().get("firstKey").asObject().get("secondKey");
Can anyone help me?
Many json parsers have a has("key") or contains("key") accessor.
Otherwise you will have to add a condition to check if get("") returns null, or turn your whole Json object into a map, where you do the same checks.
Given I have the following json structure:
{
"Role": {
"id": "5",
"name": "bb1",
"description": "desc1",
"PermissionDeck": [
{
"id": "7",
"Permission": [
{
"id": "398"
},
{
"id": "399"
},
{
"id": "400"
},
{
"id": "401"
},
{
"id": "402"
}
],
"Limit": [
{
"id": "4"
},
{
"id": "5"
}
]
}
]
}
}
If I want to cast this into a LinkedTreeMap result so that its content could be a retrieved by:
result.get("Role") returns Map
and
result.get("Role").get("PermissionDeck").size() == 5
and
result.get("Role").get("PermissionDeck").get(0).get("id") == 398
basically makes gson.fromjson recursively go into the structure, and fold any nested structure into LinkedTreeMap until it gets to the most inner layer, which then gets into LinkedTreeMap
Is this possible without writing custom recursive methods?
You can't. The closest you'll get is with JsonObject and using the appropriate getter for each nested member. In other words, your code needs to be explicit about what it expects in the JSON.
For example
JsonObject result = new Gson().fromJson(theJson), JsonObject.class);
System.out.println(result.getAsJsonObject("Role").getAsJsonArray("PermissionDeck").size());
will print 1 since you only have one element in the JSON array named PermissionDeck in the JSON object named Role in the root JSON object.